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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Trade accounts receivable-billed, allowance | $ 3,628 | $ 3,735
Property and equipment, accumulated depreciation | 105,073 | 98,029
Intangibles, accumulated amortization | 139,836 | 125,437
Customer contract costs, accumulated amortization | 39,893 | 31,526
Long-term debt, unamortized discounts | $ 5,346 | $ 10,053
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 10,000,000 | 10,000,000
Preferred stock, shares issued | 0 | 0
Preferred stock, shares outstanding | 0 | 0
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 100,000,000 | 100,000,000
Common stock, shares reserved for employee stock purchase plan and stock incentive plans | 5,929,000 | 3,661,000
Common stock, shares outstanding | 32,713,000 | 32,891,000
Treasury stock, shares | 35,980,000 | 35,356,000
Software |  |
Intangibles, accumulated amortization | $ 139,836 | $ 125,437
Acquired customer contracts |  |
Intangibles, accumulated amortization | $ 105,778 | $ 93,767

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